Water purification unit



FIG. 1 is a front view of a water purification unit showing the new design, the partially broken line showing of tubing being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof, the partially broken line showing of tubing being for illustrative purposes only and forming no part of the claimed design;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a left side elevational view thereof. 

The ornamental design for a water purification unit, as shown and described. 